iOS学习- 13 删除Table View中的Cell - Todo App

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1.)如何删除 Table View 中的Cel l:

需要实现Protocol - UITableViewDelegate

//
// ViewController.swift
// Todo
//
// Created by Ricky Choi on 16/6/1.
// Copyright © 2016年 worm. All rights reserved.
//

import UIKit

var todos: [TodoModel] = []

func dateFromString(dateStr: String) -> NSDate? {
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "yyy-MM-dd"
let date = dateFormatter.dateFromString(dateStr)
return date
}

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {

@IBOutlet weak var tableView: UITableView!

override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
todos = [TodoModel(id: "1", image: "child-selected", title: "1. 去游乐场", date: dateFromString("2014-11-2")!),
TodoModel(id: "2", image: "shopping-cart-selected", title: "2. ", date: dateFromString("2014-10-28")!),
TodoModel(id: "3", image: "phone-selected", title: "3. 打电话", date: dateFromString("2014-10-30")!),
TodoModel(id: "4", image: "travel-selected", title: "4. Travel to Europe", date: dateFromString("2014-10-31")!),
]
}

override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}

//Implement UITableviewDataSource
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
//return 50
return todos.count
}


func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = self.tableView.dequeueReusableCellWithIdentifier("todoCell")! as UITableViewCell

var todo = todos[indexPath.row] as TodoModel

//get control from tag
var image = cell.viewWithTag(101) as! UIImageView
var title = cell.viewWithTag(102) as! UILabel
var date = cell.viewWithTag(103) as! UILabel

image.image = UIImage(named: todo.image)
title.text = todo.title

let locale = NSLocale.currentLocale()
let dateFormat = NSDateFormatter.dateFormatFromTemplate("yyyy-MM-dd", options: 0, locale: locale)
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = dateFormat
date.text = dateFormatter.stringFromDate(todo.date)


return cell
}


//Implement UITableviewDelegate

func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
if editingStyle == UITableViewCellEditingStyle.Delete {
todos.removeAtIndex(indexPath.row)
self.tableView.reloadData()
}
}

}

screen: 从右到拖动Cell，显示删除

但动作没有动画效果，如下增加动画效果：

//Implement UITableviewDelegate

func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
if editingStyle == UITableViewCellEditingStyle.Delete {
todos.removeAtIndex(indexPath.row)
//self.tableView.reloadData()
self.tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.Automatic)

}
}

在 Navigation bar 增加一个Edit Mode:

Editor -> Embed in -> Navigation Controller

1.) navigationItem.leftBarButtonItem = editButtonItem()

2.) override func setEditing

//
// ViewController.swift
// Todo
//
// Created by Ricky Choi on 16/6/1.
// Copyright © 2016年 worm. All rights reserved.
//

import UIKit

var todos: [TodoModel] = []

func dateFromString(dateStr: String) -> NSDate? {
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "yyy-MM-dd"
let date = dateFormatter.dateFromString(dateStr)
return date
}

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {

@IBOutlet weak var tableView: UITableView!

override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
todos = [TodoModel(id: "1", image: "child-selected", title: "1. 去游乐场", date: dateFromString("2014-11-2")!),
TodoModel(id: "2", image: "shopping-cart-selected", title: "2. 购物", date: dateFromString("2014-10-28")!),
TodoModel(id: "3", image: "phone-selected", title: "3. 打电话", date: dateFromString("2014-10-30")!),
TodoModel(id: "4", image: "travel-selected", title: "4. Travel to Europe", date: dateFromString("2014-10-31")!),
]

navigationItem.leftBarButtonItem = editButtonItem()
}

override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}

//Implement UITableviewDataSource
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
//return 50
return todos.count
}


func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = self.tableView.dequeueReusableCellWithIdentifier("todoCell")! as UITableViewCell

var todo = todos[indexPath.row] as TodoModel

//get control from tag
var image = cell.viewWithTag(101) as! UIImageView
var title = cell.viewWithTag(102) as! UILabel
var date = cell.viewWithTag(103) as! UILabel

image.image = UIImage(named: todo.image)
title.text = todo.title

let locale = NSLocale.currentLocale()
let dateFormat = NSDateFormatter.dateFormatFromTemplate("yyyy-MM-dd", options: 0, locale: locale)
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = dateFormat
date.text = dateFormatter.stringFromDate(todo.date)


return cell
}


//Implement UITableviewDelegate

func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
if editingStyle == UITableViewCellEditingStyle.Delete {
todos.removeAtIndex(indexPath.row)
//self.tableView.reloadData()
self.tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.Automatic)

}
}


//Edit Mode in navigation bar
override func setEditing(editing: Bool, animated: Bool) {
super.setEditing(editing , animated: animated)
self.tableView.setEditing(editing, animated: animated)
}
}

screen:

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